Question

Oblicz. Zad 4 str 70.

/ to kreska ułamkowa

a) 1/2 - 3/6=
1/2 - 3/8=
4/5 - 19/25=
11/18 - 5/9=

b) 2 i 2/3 - 1 i 4/5=
1 i 2/6 - 2/3=
2 i 1/4 - 1 i 6/8=
3 i 1/3 - 2 i 10/15=

Daję naj!!!

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Proszę o całe (skracanie, rozszeżanie) obliczenia

Answer 1

A) 
1/2 - 3/6 = (1/2 *3) - 3/6 = 3/6 -3/6 = 0
1/2 - 3/8 = (1/2 *4) - 3/8 = 4/8 - 3/8 =1/8
4/5 - 19/25 = (4/5 *5) - 19/25 = 20/25 - 19/25 = 1/25
11/18 - 5/9 = 11/18 - (5/9 *2) = 11/18 - 10/18 = 1/18 

b)
2 i 2/3 - 1 i 4/5 = 8/3 - 9/5 = (8/3 *5) - (9/5 *3) = 40/15 - 27/15 = 13/15
1 i 2/6 - 2/3 = 8/6 - 2/3 = 8/6 - (2/3 *2) = 8/6 - 4/6 = 4/6 (:2) = 2/3
2 i 1/4 - 1 i 6/8 = 9/4 - 14/8 = (9/4 *2) - 14/8 = 18/8 - 14/8 =4/8 (:4) = 1/4
3 i 2/3 - 2 i 10/15 = 11/3 - 40/15 = (11/3 *5) - 40/15 = 55/15 - 40/15 = 15/15 = 1